Five-Axis HSM Tool-Path Planning of Integral Impeller

2010 ◽  
Vol 426-427 ◽  
pp. 572-576
Author(s):  
Can Zhao ◽  
Y.Y. Guo ◽  
Guang Bin Bu
Keyword(s):  
High Speed ◽  
Control Algorithm ◽  
Tool Path ◽  
Control Method ◽  
Interpolation Method ◽  
Linear Interpolation ◽  
Normal Vector ◽  
Manufacture Process ◽  
Five Axis ◽  
Uniform Change

There are two key problems in the manufacture process of impeller with HSM(High Speed Machining). One is the collision between tool and blade, the other is gnawed-cutting arisen by non-uniform change of the cutter axis. The control algorithm of collision-free cutter-axis was described and applied in this paper. The cutter-axis vector was optimized by quaternary linear interpolation method to make normal vector of blade changing continuous, so. These methods were synthetically used in the manufacture experiment. And the qualified impeller was produced. It indicated that the tool vector control method was feasible.

Five-Axis Machining Tool Vector Control of Impeller

2009 ◽  
Vol 407-408 ◽  
pp. 264-267 ◽  
Author(s):  
Can Zhao ◽  
Jian Feng Sun ◽  
Guang Bin Bu
Keyword(s):  
Vector Control ◽  
Control Algorithm ◽  
Interpolation Method ◽  
Linear Interpolation ◽  
Normal Vector ◽  
Manufacture Process ◽  
Linear Interpolation Method ◽  
Tip Position ◽  
Five Axis ◽  
Uniform Change

There are two key problems in the manufacture process of impeller, one is the collision of tool and blade, the other is gnawed-cutting arisen by non-uniform change of the cutter axis. UG software was used to solve those problems. Tool tip position was solved by UG. The control algorithm of collision-free cutter-axis was described and applied. The cutter-axis vector was optimized by quaternary linear interpolation method to make normal vector of blade changing continuous, so. These methods were synthetically used in the manufacture experiment. The impeller produced by it was qualified. It indicated that the method of tool vector control was feasible.

Collision-Free Tool Path Generation for Five-Axis High Speed Machining

2011 ◽  
Vol 474-476 ◽  
pp. 961-966 ◽  
Author(s):  
Li Qiang Zhang ◽  
Min Yue
Keyword(s):  
Image Analysis ◽  
Collision Detection ◽  
High Speed ◽  
Tool Path ◽  
Geometric Model ◽  
High Speed Machining ◽  
Analysis Method ◽  
Geometric Information ◽  
Detection Approach ◽  
Five Axis

Collision detection is a critical problem in five-axis high speed machining. Using a combination of process simulation and collision detection based on image analysis, a rapid detection approach is developed. The geometric model provides the cut geometry for the collision detection and records a dynamic geometric information for in-process workpiece. For the precise collision detection, a strategy of image analysis method is developed in order to make the approach efficient and maintian a high detection precision. An example of five-axis machining propeller is studied to demonstrate the proposed approach. It has shown that the collision detection task can be achieved with a near real-time performance.

scholarly journals Kinematic Tool-Path Smoothing for 6-Axis Industrial Machining Robots

2021 ◽  
Vol 15 (5) ◽  
pp. 621-630
Author(s):  
Shingo Tajima ◽  
◽  
Satoshi Iwamoto ◽  
Hayato Yoshioka
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Trajectory Generation ◽  
Linear Interpolation ◽  
Joint Space ◽  
Industrial Robots ◽  
Generation Algorithm ◽  
High Flexibility ◽  
Tool Motion ◽  
Trajectory Generation Algorithm

The demands for machining by industrial robots have been increasing owing to their low installation cost and high flexibility. A novel trajectory generation algorithm for high-speed and high-accuracy machining by industrial robots is proposed in this paper. Linear interpolation in the workspace and smooth trajectory generation at the corners are important in industrial machining robots. Because industrial robots are composed of rotational joints, the joint space has a nonlinear relationship with the workspace. Therefore, linear interpolation in the joint space, which has been widely used in conventional machine tools, does not guarantee linear interpolation in the actual machining workspace. This results in the degradation of the machining surface. The proposed trajectory generation algorithm based on the decoupled approach can achieve linear interpolation in the workspace by separating the position commands into Cartesian coordinates and the orientation commands into spherical coordinates. In addition, a novel corner smoothing method that generates a smooth and continuous trajectory from discrete commands is proposed in this paper. The proposed kinematic local corner smoothing generates a smooth trajectory by using a 3-segmented constant jerk profile at the corners in the joint space. The sharp corners can thereby be replaced by smooth curves. The resulting cornering error is controlled by varying the cornering duration. The simulation results demonstrate the effectiveness of the proposed kinematic smoothing algorithm in achieving linear tool motion in straight sections and in generating smooth trajectories at corner sections within the user-defined tolerance.

Development of a Virtual Controller Integrating Virtual and Physical CNC

2006 ◽  
Vol 505-507 ◽  
pp. 631-636 ◽  
Author(s):  
Yung Chou Kao ◽  
Hong Ying Chen ◽  
Y.C. Chen
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Three Dimensional ◽  
Visual Basic ◽  
Cnc Machine ◽  
Geometry Model ◽  
International Exposition ◽  
Five Axis ◽  
Cnc Controller ◽  
Self Learning

This paper describes the development of a virtual CNC controller. Controller is the major driver for a CNC machine. Similarly, virtual controller is the key driving component for a virtual CNC, which is a three-dimensional digitized physical CNC. A virtual CNC can exist in every PC serving as the complementary safer counterpart in lecturing and learning the hand on operation of expensive machinery such as five-axis milling machine, high speed CNC and mill-turn because the virtual CNC will not break. Virtual reality environment provided by EON studio software has been adopted in establishing the interactivity of a virtual CNC based on the geometry model constructed in off-the-shelf CAD software. Visual Basic was used in implementing the graphical user interface to operate the virtual CNC through the developed virtual controller. The virtual controller is in charge of (1) parsing user’s NC codes, (2) simulating the tool path of the parsed NC codes, and (3)driving the virtual CNC according to the tool path. The developed virtual CNC controller has been successfully applied in implementing virtual CNCs based on two physical three-axis CNC machines and has also been demonstrated in an international exposition successfully. The virtual controller can enable the virtual CNC in facilitating lecturing, tutoring, self-learning, and reducing the chances of accidental breakdown of precious CNC equipment.

An Optimal Feed Interpolation Algorithm for High-Speed Five-Axis Machining

2006 ◽  
Vol 532-533 ◽  
pp. 873-876 ◽  
Author(s):  
Yu Han Wang ◽  
Jing Chun Feng ◽  
Yu Hao Li ◽  
Ming Chen
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Upper Bounds ◽  
Interpolation Algorithm ◽  
Sharp Corner ◽  
Machining Dynamics ◽  
Linear Distance ◽  
Smooth Motion ◽  
Optimal Feed ◽  
Five Axis

To alleviate the feed fluctuation and maintain a smooth feed in five-axis machining, this paper takes the following two constraints into account: (1) the machining dynamics, including the constraints of power, velocity and acceleration represented by upper bounds for each axis (2) the contour constraints of the tool path, including the linear distance of the segment and sharp corner at the segment junctions. With the analysis of these constraints, the optimal feed is derived and the corresponding adjusted interpolation algorithm is presented such that a smooth motion during the machining can be obtained. The presented algorithm is demonstrated by the simulation result.

Five Axis Swept Profiles of Torus Like Cutters via Separation of Inner and Outer Characteristic Curves

2018 ◽  
Author(s):  
Eyyup Aras
Keyword(s):  
Tool Path ◽  
Rotation Axis ◽  
Linear Interpolation ◽  
Unit Vector ◽  
Industrial Applications ◽  
Body Motion ◽  
Moving Frames ◽  
Closed Form Solutions ◽  
Toroidal Surface ◽  
Five Axis

A broadly applicable formulation for identifying the swept profiles (SWP) generated by subsets of a toroidal surface is presented. While the problem of locating the entire SWP of a torus has been extensively addressed in the literature, this rarely addressed problem is of significance to NC machining with non-standard shape of milling tools. A torus, generated by revolving a circle about an axis coplanar with the circle, is made up of inner and outer parts of a tube. The common use of the torus is in a fillet-end mill which contains only the fourth quadrant of a cross section of the tube. However, in the industrial applications the different regions of the torus geometry appear. Especially we can see this on the profile cutters, such as the corner-rounding and concave-radius end mills. Also to the best of our knowledge, the interior of the torus-tube is either neglected or represented by B-spline curves in literature. In case of common milling tool surfaces such as sphere, cylinder and frustum there exists only one SWP in any instance of a tool movement. But, in case of the toroidal surface there exist two sophisticated SWPs and we need to consider only one of them in tool swept envelope generation. Therefore, considering the complexity of five-axis tool motions there is a need not only to distinguish the front from the rear of the cutter but also the exterior from the interior of a tube. This paper presents a methodology and algorithms for analytically formulating the SWP of any sub-set of the torus in five-axis tool motions. By introducing the rigid body motion theory, two moving frames along with a fixed frame are defined. Arbitrary poses of a tool between tool path locations are interpolated by a spherical linear interpolation (slerp) whose effect is a rotation with uniform angular velocity around a fixed rotation axis. For the problem of NC simulation, by using the envelope theory the closed-form solutions of swept profiles are formulated as two-unit vector functions.

scholarly journals Kinematical Smoothing of Rotary Axis near Singularity Point

2016 ◽  
Vol 836-837 ◽  
pp. 501-508
Author(s):  
Laureen Grandguillaume ◽  
Sylvain Lavernhe ◽  
Christophe Tournier
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Maximum Velocity ◽  
Linear Interpolation ◽  
Experimental Investigations ◽  
Axis Orientation ◽  
Rotary Axis ◽  
Spline Curves ◽  
Tool Axis ◽  
Singularity Point

This paper deals with singular configurations of a 5-axis machine tool in high speed milling which may lead to the appearance of large incoherent movements of rotary axes near singularity points. These movements generate slowdowns of the actual feedrate during the execution of the tool path, which affect quality and productivity. Thus, this paper proposes a method to detect these behaviors during machining simulation and correct the tool path. Unlike the literature methods, this correction consists in modifying the tool axis orientation by going through the singularity point while respecting maximum velocity, acceleration and jerk of the rotary axis. For that purpose, the initial articular positions of the rotary axis near the singularity point are fitted with B-spline curves, modified and finally discretized for linear interpolation. Experimental investigations on a test part are carried out to show the efficiency of the method.

Research on Subdivision Interpolation for High Speed CNC Applications

2011 ◽  
Vol 141 ◽  
pp. 449-454
Author(s):  
Jing Chuan Dong ◽  
Qing Jian Liu ◽  
Tai Yong Wang
Keyword(s):  
High Speed ◽  
Tool Path ◽  
Tracking Error ◽  
Linear Interpolation ◽  
Cnc Machining ◽  
Contour Error ◽  
Interpolation Scheme ◽  
Simulation Results ◽  
Cnc Controller ◽  
Better Than

High speed CNC machining relies on the smooth interpolation of tool path in order to prevent impact and vibration. We present a new interpolation scheme for CNC controller based on 6-point subdivision. The subdivision interpolation improves the smoothness of the original trajectory, while maintaining the accuracy. The algorithm is simple and effective, and therefore it is suitable for real-time execution in CNC controllers. Simulation results show that the proposed method performs better than linear interpolation, since the tracking error and contour error is reduced.

Research on CNC Key Technology for High Speed Milling

2011 ◽  
Vol 467-469 ◽  
pp. 252-256
Author(s):  
Zhen Yu Zhao ◽  
Dong Ying Liang ◽  
Yong Shan Xiao ◽  
Bai Liu
Keyword(s):  
High Speed ◽  
Tool Path ◽  
High Efficiency ◽  
Linear Interpolation ◽  
Machining Performance ◽  
B Spline ◽  
Curve Interpolation ◽  
High Flexibility ◽  
Circular Interpolation ◽  
Cutting Mechanisms

At present, high speed machining (HSM) features in high efficiency, high precision, high flexibility and high quality. HSM technology involves many factors, including cutting mechanisms, machining performance, tool path and other aspects. The key techniques on HSM such as linear interpolation, circular interpolation, cubic B-spline curve interpolation, non-uniform rational B-spline (NURBS) curve interpolation and their respective characteristics are paid more attention and expatiated.

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